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Chemically tailored dielectric-to-metal transition for the design of metamaterials from nanoimprinted colloidal nanocrystals

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)350-357
Number of pages8
JournalNano Letters
Volume13
Issue number2
DOIs
Publication statusPublished - 13 Feb 2013
Externally publishedYes
Publication typeA1 Journal article-refereed

Abstract

We demonstrate optical metamaterial design using colloidal gold nanocrystal building blocks. In the solid state, chemically exchanging the nanocrystals' surface-capping molecules provides a tailorable dielectric-to-metal transition exhibiting a 1010 range in DC conductivity and dielectric permittivity ranging from everywhere positive to everywhere negative throughout the visible-to-near-IR. Direct, wide-area nanoimprinting of subwavelength superstructures at room temperature, on plastic and glass substrates, affords plasmonic resonances ranging from 660 to 1070 nm, in agreement with numerical simulations.

Keywords

  • ammonium thiocyanate, dielectric function, gold nanoparticles, ligand exchange, Plasmonics, soft lithography